A
and()
- A built-in function that accepts a list and returns the unification of all elements in the list
B
bool
- A primitive type representing the set of Boolean
truth values denoted by the keywords
trueandfalse
Built-in functions
- Predeclared functions provided by the CUE runtime that are available without being imported
- see also:
and()|close()|div()|mod()|len()|or()|quo()|rem()
bytes
🔗 Language Spec | Tour
- A primitive type representing a possibly empty sequence of arbitrary bytes
C
close()
- A built-in function that converts a partially defined (“open”) struct to a fully defined (“closed”) struct
D
Default value
🔗 Tour | Howto Guide
- The single element of a disjunction that CUE assigns to a field if and only if unification fails to resolve a concrete value for the field
- An element of a disjunction prefixed with an asterisk (
*)
Disjunction
div()
- A built-in function that performs Euclidean division with its parameters and returns the integer quotient
F
Field
🔗 Tour
- A key-value pair inside a map, associating a value with a given set of keys
Field constraint
🔗 Language Spec | Tour
- A field constraint restricts a field’s value without actually defining the field, with the field only forming part of the output if it is successfully unified with a concrete value
- see also: Required field constraint | Optional field constraint
float
🔗 Language Spec | Tour
- A primitive type representing the set of all decimal floating-point numbers
J
JSON
🔗 json.org
- “A lightweight data-interchange format … easy for humans to read and write [and] easy for machines to parse and generate.” – json.org
- A data format understood by the
cueCLI, which can both parse and emit JSON as input and output
L
len()
- A built-in function that returns the lengths of various types as an integer
List
🔗 Language Spec | Tour
- An arbitrary sequence of CUE values, enclosed in square brackets (
[]) with values separated by commas (,)
M
mod()
- A built-in function that performs Euclidean division with its parameters and returns the integer remainder
N
null
- A primitive type whose only value, the null
value, is represented with the keyword
null. Comparable with itself and any other type, the comparison with anullvalue always being equal and the comparison with any other type always being unequal
number
🔗 Language Spec | Tour
O
Optional field constraint
🔗 Tour | Howto Guide
- A field constraint that restricts the field’s value if the field is present, whilst also permitting the field’s absence
or()
- A built-in function that accepts a list and produces a disjunction
Q
quo()
- A built-in function that performs truncated division with its parameters and returns the integer quotient
R
“Raw” strings
🔗 Language Spec | Tour
- A
stringliteral enclosed with an equal number of hashes on both sides, allowing escape sequences to appear inside the text verbatim, without their usual escaping taking effect
rem()
- A built-in function that performs truncated division with its parameters and returns the integer remainder
Required field constraint
🔗 Tour | Howto Guide
- A field constraint that restricts the field’s value whilst also requiring the field to be present
S
string
🔗 Language Spec | Tour
- A primitive type representing the set of UTF-8 strings
- see also: Raw strings
Struct
🔗 Language Spec | Tour
- A composite type representing a set of elements (called fields) each of which has a name (called a label) and a value
U